data = np.load('data.npy')  # 2d-array

m = Basemap(llcrnrlat=south, urcrnrlat=north,
            llcrnrlat=west, urcrnrlon=east,
            resolution='l',area_thresh=10000)
m.drawcoastlines(linewidth=0.4)
m.drawmeridians(np.arange(0,360,60),  linewidth=0.5, dashes=[2,1], labels=[0,0,0,1])
m.drawparallels(np.arange(-90,91,30), linewidth=0.5, dashes=[2,1], labels=[1,0,0,0])

m.imshow(data, cmap=colormap)
plt.colorbar(aspect=50, pad=0.08, orientation='horizontal')